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Sea Lamprey are killing the other animals, not a poisonous water.

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Great blue heron, one of the predators  of lake trout

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Great blue heron, one of the predators  of lake trout

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This is insect larvae, one of the producers in the Great Lakes food web.

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one of the other predators called a walleye

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Could the prey of trout be moving somewhere else? The temperature of the water could be too cold or warm for their prey leading to them swimming somewhere else causing lake trout to run out of food.

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the temperature is making them leave

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great blue heron that feeds on trout

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Is there some kind of poison or something killing the animals in the food web?

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Could there be an issue with the food web?

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Could there be an issue with the food web?

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There could possibly be an issue with the food web. Maybe one animal like plankton could be dying, leading up to trout and other animals running out of food.

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I wonder what could possibly be happening to the trout? I mean, not just ONE population could cause all that damage! I know well enough, and I'm sure that you know too, that the trout have PLENTY of options. This's got to be happening at the source, with the producers, but what?

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Trout usually go to a place where the current isn't that strong so they don't have to waste a lot of energy. The water has to be moving fast enough for their prey to basically just swim towards the trout.

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Mayfly nymph, something that trout eat.

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Food web at Yellowstone Lake

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When trout grow up, one of the foods that they eat is Lake Whitefish.

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Crayfish, one of the foods that trout eat

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Young trouts like to eat invertebrates while fully grown trout like to eat fish like rainbow smelt, sculpin, chub, and alewives.

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Why my community loves the alewife herring.

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this is one of the food sources called a sculpin